Sorry, I haven't been clear. The costume is not silly because it is insufficiently dull/'practical', it is silly to me because its overall design is ugly and faintly comic in the 'Mickey Mouse' sense. Pfieffer's costume was much better, because it was a stronger design. As far as 'practicality' is really necessary in a Batman movie, the costume used in the comics since the 1990s accomplishes it more fully while looking a lot nicer, too.